<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card class="cat_opt">
            <!-- 警告 -->
            <el-alert title="只能选择第三级分类" type="warning" show-icon :claseable="false"></el-alert>
            <!-- 选择分类 -->
            <el-row>
                <el-col>
                    <span>选择商品分类：</span>
                    <el-cascader
                        v-model="selectedCate"
                        :options="categoriesList"
                        :props="paramsProps"
                        @change="handleParamsChange"
                    ></el-cascader>
                </el-col>
            </el-row>
            <!-- 标签页 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isButtonDisabled" @click="showAddDialog">添加参数</el-button>
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag :closable="true" @close="removeTagParams(scope.row, i)" v-for="(item, i) in scope.row.attr_vals" :key="i">{{ item }}</el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 静态参数面板 -->
                <el-tab-pane label="静态参数" name="only">
                    <el-button type="primary" size="mini" :disabled="isButtonDisabled" @click="showAddDialog">添加参数</el-button>
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand"></el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 编辑参数的对话框 -->
        <el-dialog :title="'编辑' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 选中的值
            selectedCate: [],
            // 分类参数列表
            categoriesList: [],
            // 级联选择器配置
            paramsProps: {
                expandTrigger: 'hover', // 展开的触发方式
                value: 'cat_id', // 选项的值
                label: 'cat_name', // 选择显示的内容
                children: 'children' // 子节点
            },
            // tab 已选择的标签页
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态参数的数据
            onlyTableData: [],
            // 添加参数的表单数据
            addForm: {
                attr_name: ''
            },
            // 控制添加参数的对话框
            addDialogVisible: false,
            // 添加参数的表单验证规则
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数', trigger: 'blur' }
                ]
            },
            // 控制编辑参数的对话框
            editDialogVisible: false,
            // 编辑参数的表单数据
            editForm: {
                attr_name: '',
                attr_id: ''
            },
            // 编辑参数的表单数据验证规则
            editFormRules: {
                attr_name: [
                    { required: true, message: '请输入', trigger: 'blur' }
                ]
            }
        }
    },
    created() {
        this.getCategoriesList();
    },
    methods: {
        // 监听级联选择器
        handleParamsChange() {
            this.getParamsList();
        },
        // 获取商品列表
        async getCategoriesList() {
            const { data: res } = await this.$http.get('categories');

            if(res.meta.status !== 200) {
                return this.$message.error(res.meta.msg);
            }

            this.$message.success(res.meta.msg);
            this.categoriesList = res.data;
        },
        // 点击标签页
        handleTabClick() {
            console.log(this.activeName);
            this.getParamsList();
        },
        // 获取参数列表
        async getParamsList() {
            // 判断是不是三级分类
            if(this.selectedCate.length !== 3) {
                this.selectedCate = [];
                this.manyTableData = [];
                this.onlyTableData = [];
                return;
            }

            // categories/:id/attributes
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                params: { sel: this.activeName }
            });

            if(res.meta.status !== 200) {
                return this.$message.error(res.meta.msg);
            }

            this.$message.success(res.meta.msg);

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                // 为了保持唯一性，所以在这里添加
                item.inputVisible = false;
                item.inputValue = '';
            });

            console.log(res.data);

            if(this.activeName === 'many') {
                this.manyTableData = res.data;
            } else {
                this.onlyTableData = res.data;
            }
        },
        // 显示对话框
        showAddDialog() {
            this.addDialogVisible = true;
        },
        // 监听添加参数对话框关闭
        addDialogClosed() {
            this.$refs.addFormRef.resetFields();
        },
        // 提交参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return;
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                });

                if(res.meta.status !== 201) {
                    return this.$message.error(res.meta.msg);
                }

                this.$message.success(res.meta.msg);
                this.addDialogVisible = false;
                this.getParamsList();
            });
        },
        // 编辑参数
        async editParams() {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                attr_name: this.editForm.attr_name,
                attr_sel: this.activeName
            });

            if(res.meta.status !== 200) {
                return this.$message.error(res.meta.msg);
            }

            this.$message.success(res.meta.msg);
            this.editDialogVisible = false;
            this.getParamsList();
        },
        // 显示编辑参数的对话框
        async showEditDialog(attr_id) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`);

            if(res.meta.status !== 200) {
                return this.$message.error(res.meta.msg);
            }

            this.$message.success(res.meta.msg);
            this.editForm.attr_name = res.data.attr_name;
            this.editForm.attr_id = res.data.attr_id;
            this.editDialogVisible = true;
        },
        // 监听编辑参数的对话框关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields();
        },
        // 删除参数
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('是否删除此参数', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err);

            if(confirmResult !== 'confirm') {
                return this.$message.info('取消删除');
            }

            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);

            if(res.meta.status !== 200) {
                return this.$message.error(res.meta.msg);
            }

            this.$message.success(res.meta.msg);
            this.getParamsList();
        },
        // 监听 Enter 或 blur
        handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = '';
                row.inputVisible = false;
                return;
            }
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = '';
            row.inputVisible = false;
            this.saveAttrVals(row);
        },
        // 显示 input
        showInput(row) {
            row.inputVisible = true;
            // 让文本框自动获得焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会执行回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus()
            });
        },
        // 添加参数
        async saveAttrVals(row) {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            });

            if(res.meta.status !== 200) {
                return this.$message.error(res.meta.msg);
            }

            this.$message.success(res.meta.msg);
        },
        // 删除标签参数
        removeTagParams(row, i) {
            row.attr_vals.splice(i, 1);
            this.saveAttrVals(row);
        }
    },
    computed: {
        // 当前选择的三级分类的 id
        cateId() {
            if(this.selectedCate.length === 3) {
                return this.selectedCate[2];
            }
            return null;
        },
        // 判断按钮是否可用
        isButtonDisabled() {
            if(this.selectedCate.length !== 3) {
                return true;
            }
            return false;
        },
        // 设置添加参数的标题文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数';
            } else {
                return '静态参数';
            }
        }
    }
}
</script>

<style lang="less">
.cat_opt {
    margin: 15px;
}
.input-new-tag {
    width: 120px!important;
}
</style>